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Block-Synchronization Context-Free Grammars

In: Advances in Algorithms, Languages, and Complexity

Author

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  • Helmut Jürgensen

    (University of Western Ontario, Department of Computer Science)

  • Kai Salomaa

    (University of Western Ontario, Department of Computer Science)

Abstract

We consider context-free type block-synchronization grammars, BSCF grammars, where independent derivations can communicate using nested synchronization conditions. We prove inclusion relations between the language families defined by grammars using, respectively, the weak and strong prefix- or equality-synchronized derivation mode. In particular, the weak BSCF languages are strictly included in the family of strong BSCF languages for both the prefix- and equality-synchronized derivation mode. We can effectively decide whether the language generated by a weak BSCF grammar is empty.

Suggested Citation

  • Helmut Jürgensen & Kai Salomaa, 1997. "Block-Synchronization Context-Free Grammars," Springer Books, in: Ding-Zhu Du & Ker-I Ko (ed.), Advances in Algorithms, Languages, and Complexity, pages 111-137, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4613-3394-4_5
    DOI: 10.1007/978-1-4613-3394-4_5
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